Search for a right-handed W boson and a heavy neutrino in proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

A search is presented for a right-handed W boson (W${}_{\mathrm{R}}$) and a heavy neutrino (N), in a final state consisting of two same-flavor leptons (ee or $\mu \mu$) and two quarks. The search is performed with the CMS experiment at the CERN LHC using a data sample of proton-proton collisions at a center-of-mass energy of 13 TeV corresponding to an integrated luminosity of 138 fb${}^{-1}$. The search covers two regions of phase space, one where the decay products of the heavy neutrino are merged into a single large-area jet, and one where the decay products are well separated. The expected signal is characterized by an excess in the invariant mass distribution of the final-state objects. No significant excess over the standard model background expectations is observed. The observations are interpreted as upper limits on the product of W${}_{\mathrm{R}}$ production cross sections and branching fractions assuming that couplings are identical to those of the standard model W boson. For N masses $m_{\mathrm{N}}$ equal to half the W${}_{\mathrm{R}}$ mass $m_{{\mathrm{W}}_{\mathrm{R}}}$ ($m_{\mathrm{N}}$ = 0.2 TeV), $m_{{\mathrm{W}}_{\mathrm{R}}}$ is excluded at 95% confidence level up to 4.7 (4.8) and 5.0 (5.4) TeV for the electron and muon channels, respectively. This analysis provides the most stringent limits on the W${}_{\mathrm{R}}$ mass to date.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/EXO-20-002 (CMS Public Pages)

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